Bolt-anchor.



unirsi) 's 'rnfrns PATENT OFFICE.

'FREDERICK C. PALMER, OF SPRINGFIELD, MASSACHUSETTS BOLT-ANGHOR.

livf. 833,542.

l Specification of Letters Patent.y

Application filed January 11,1906. Serial No 295,545.

Patented Oct. 16, 1906.

To @ZZ whom, zit may concern:

Be it known that I, FREDERICK C. PALMER, a citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented certain new-and useful Improvements in Bol*- Anchors, of which the following is a specifiview showing a partial expansion, and Fig. 3

have shown two.

is a similar view showing a double expansion.

Fig. 4 is a bottom plan view of the upper half of the parts above the plane of the line 4 4 in Fig. 1. Fig. 5 is a side elevation of one of the shields, and Fig. 6 is -a bottom plan view of the same. Fig. 7 is a side elevation ofthe outer separable bushing. Fig. 8 is a top plan view of the inner separable bushing when one threaded aperture is horizontally placed, and Fig. 9 is a similar'view of the same when the other threaded aperture at rightangles thereto is horizontally placed. Fig. 10 is a perspective view of the inner bushing. Fig. 11 is a central section ofthe inner bushing, showing a fine-threaded screw engaged therewith; and Fi. 12 is a similar view showing a coarse-threa ed screw engaged therewith.

In the drawings, 10 10 are shields, made of any suitable kind of soft metal and cast, stamped, or rolledinto shape. Each shield constitutes a longitudinal segment of a cylinder, polyhedron, or similar symmetrical solid. Each tapers slightly outwardly internally at each end 11 11, 4and each is provided near each end with recesses, notches, or slots 12 12 for the reception of wedges 22 and 33 of separable bushings 20 and 30, respectively, and each shield is also preferably provided with means, as the projections 13 13 and corresponding recesses 14 14, for accurately registering the parts when assembled. These shields may b e of any convenient number. I It is essential, however, that when assembled they should form a hollow symmetrical sleeve which preferably tapers slightly at 11 11, so that internally its diameter is a little larger at each end than in the center. The internal surface of each shield is preferably smooth o'r rough, as may be preferred. i i

vsmoot I 20 is a separable tubular bushing adapted est to their outer ends when placed in the wall. It is slightly conical externally, tapering slightly toward its inner end, and may be or threaded internally. v It is provided externally with a plurality of wedges 22 22, made integral with the body of the bushing or firmly secured thereto.` If it is threaded internally, the threads may be cut to two gages in orderto engage with bolts differently threaded to correspond.

30 is a second separable tubular bushing adapted to be placed between the shields 1() 10 nearest to their vinner ends -when placed in' to be placed between the shields 1() 1() nearthe wall. It is preferably of the form of'a cube' i with rounded truncated corners, so 'that it` lwill move readily between the shields =10 10.` It is threaded along one axis at 31 to one gage and along a second axis 32 to a second ,I gage, while'its two-remaining unaperturedy sides are provided with external wedges 33,

arranged in line with its third axis.

40 is a bolt the threads of which are comparatively coarse, and 50 is a bolt the threads of which are relativel fine. The aperture in the bushing 20 shoul be large enough to permit the free passage of the bolt which is to engage with the threads of the apertures in the bushing 30, so' that if the bushing 2O is internally threaded the bolt passing through' it will not engage such threads when both bushings are employed. v

The manner of using my device 1s as follows: The parts are firstassembled as shown in Fig. 1, the inner and outer tubular bushings being each placed in position so that the wedges 22 and 33 fit into the recesses 12 12, provided for that purpose. kIt will be found that the bushing 2O will project slightly outward beyond the shields l() 10, as shown inv Fig. 1, when the parts aref'inade of the proportions `illustated. If now the boltl 40 is inserted and rotated to hold something against thewall in which the anchor is` placed, its threads engage with those of the bushing 30 until its forward rotation is stopped by pressure against the article to be secured. Its further rotation drawsback the bushing 30, and as the recess 12 12 at the inner end of the shields and their inner surfaces 11 11 at the same end Hare outwardly such rotation presses apart 'the shields at their inner en ds,

and therefore holds them firmly against the aperture in the` wall in which they have `been inserted, as shown in Fig.v2. If now the ro- IIO" ` tation of the bolt is continued, the bushing 20 comes in contact with the head of the bolt and presses against the inner outwardly flaring surfaces' of the assembled shields 10 10 at their outer end. The wedges '22 22 tend to press apart the shields also by reason of their contact with the inclined sides of the recesses 12 12. The parts inally assume the position illustrated in Fig. 3, and the bolt is firmly held in position against the object to be secured by reason of such double eXpan-.

sion. .This does not, however, exhaust the usefulness of the device. By turning the bushing 30 a quarter 'of the way around the second threaded aperture having threads 31 is presented for engagement with another bolt 50, threaded to fit the same. By supglying a number of these double-apertured ushings the same shields may be used with a large number of diTerently-threaded bolts, each bushing being adapted to serve with two of such bolts provided with threads of the use of my device, therefore, one set of shields maybe used with bolts of three sizes,

and by the use of additional double-threaded bushings its capacity can 'be much increased.

vWhat I claim as new is- 1. In a device of the kind described, comprising separable shields, a tubular bushing adapted to be inclosed by the shields and threaded (to engage bolts or screws) in the lines of diiierent axes.

2. In a device of the kind described, comprising separable shields, a tubular bushing adapted to be inclosedby the shields and threaded (to engage bolts or screws) in more than one direction with threads of different standards.

3. A tubular bushing Jfor a bolt-anchor of substantially cubical form with truncated corners and threaded in apertures along two of its axes.

4. A tubular bushing for a bolt-anchor of substantially cubical form with truncated corners and threaded in apertures along two .ot its axes and provided externally along its third aXis with wedges.

In testimony whereof I affix my signature in presence of two witnesses.

FREDERICK C. PALMER. Witnesses:

l\/IAY HUGHES,

ALAN MoDoNNELL. 

